1-Bromoindene may be prepared by dehydrobromination of 1,2-dibromoindane under conditions strongly favouring the E2 mechanism. 1-Indenylidenetriphenylphosphorane is stable, as expected, and couples with diazonium salts to give arylazo-substituted methylenephosphoranes.
P. C. Crofts and M. P. Williamson, J. Chem. Soc. C, 1967, 1093 DOI: 10.1039/J39670001093
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